Jumper member construction in a calendar watch

ABSTRACT

In a calendar watch, a jumper mechanism for operating with a toothed member such as a calendar wheel comprises a thin plate connected to a jumper by means of a flexible arm. The plate is mounted above a base plate in a construction such that the jumper lies out of the plane of the thin plate between the thin plate and the base plate.

United States Patent Miyasaka 51 June 13, 1972 JUMPER MEMBERCONSTRUCTION IN [56] References Cited A CALENDAR WATCH UNITED STATESPATENTS [72] Inventor: Mnmoru Miylsakn, Shimosuwa, Japan 3,495,395 2/i970 Fehrenbach et al. ..58/58 [73] Assignee: Knbushikl Knish: SuwaSeikosha, Tokyo, FOREIGN PATENTS ()R APPLICATIONS J an 285,530 9/1952Switzerland ..58/58 [22] Filed: July 27, 197i Primary .raminerRichard B.Wilkinson [2]] Appl' 166531 Assistant ExaminerGeorge H. Miller. Jr.

Attorney-Alex Friedman, et al. [30] Foreign Application Priority Data[57] ABSTRACT July 30, 1970 Japan 4505484 In a calendar watch. a jumpermechanism for operating with a [52] [1.8.0 ..58/58 toothed member Suchas a Calendar whee] comprises a thin [5 U Int Cl G04. 9/24 plateconnected to a jumper by means of a flexible arm. The l 58] i M 5 58 1plate is mounted above a base plate in a construction such that thejumper lies out of the plane of the thin plate between the thin plateand the base plate.

3 Clairm, 3 Drawing Figures PATENTEDJUH 13 I972 FIG. 2

L E\TOR. MAMORU MQYASAKA BY a,

ATTORNEYS JUMPER MEMBER CONSTRUCTION IN A CALENDAR WATCH BACKGROUND OFTHE INVENTION In a conventional calendar watch, a jumper is pressedagainst a date wheel by a spring and is mounted to a plate by means of ajumper holder. However, in the process of assembly, and during repairwork, it is difficult to assemble the parts due to the fact that thespring must be mounted in stressed conditions in a hollow, and that thenumber of parts which must be handled simultaneously is inconvenient,especially with respect to mass production.

SUMMARY OF THE INVENTION A date wheel holder is connected by a flexiblearm to a jumper, the three parts being cut from a single thin plate. Thedate wheel holder is mounted above a base plate. In operating position,the jumper, on its flexible arm, is bent so that it lies between thedate wheel holder and the base plate. Flexing of the arm provides theforce needed for rapid intermittent motion of the date wheel.

Accordingly, an object of the present invention is to provide a jumper,biased by a spring, and a date wheel holder in one piece.

Another object of the invention is to decrease the number of partsrequired in connection with a date wheel in a calendar watch.

A further object of the invention is a date wheel mechanism which iseasier to assemble than the present constructions and which is lessexpensive.

Still other objects and advantages of the invention will in part beobvious and will in part be apparent from the specification.

The invention accordingly comprises the features of construction,combination of elements, and arrangement of parts which will beexemplified in the construction hereinafter set forth, and the scope ofthe invention will be indicated in the claims.

BRIEF DESCRIPTION OF THE DRAWING For a fuller understanding of theinvention, reference is had to the following description taken inconnection with the accompanying drawing, in which:

FIG. 1 is an enlarged plan view of a spring member in accordance withthe present invention;

FIG. 2 is an enlarged partial plan view of a watch showing the springmember ofFIG. I in place; and

FIG. 3 is an enlarged cross-sectional view taken along the lines 33 ofFIG. 2.

DESCRIPTION OF THE PREFERRED EMBODIMENT In accordance with the presentinvention, a one-piece spring member consists of a date wheel holder 11and a jumper I2 connected to the date wheel holder 11 by a jumper spring13. The jumper spring I3 is separated from the date wheel holder 11 by aspace 14, the flexibility of the jumper spring I3 being such that thejumper I2 can be moved across the space 14 and bent transversely of theplane of the date wheel holder 11 so that the jumper 12 can be disposedbelow the plane of the spring member.

In the calendar watch are a base plate I5 (FIGS. 2 and 3) and a datewheel 16. The plate I5 has a recess 17 into which the date wheel 16fits. Also, it has a recess 18 which is bridged by the date wheel holder11. The jumper 12, during assembly is pushed toward and under the datewheel holder II, against the force exerted by the stressed jumper springI3. The jumper is held in this position by the date wheel 16. The edgeof the jumper 12 which is pressed against the teeth of date wheel I6 isV-shaped to provide a desired cam-action. The action results in the slowmovement of the date wheel until a tooth passes over the apex of the V,at which point the jumper causes the tooth, and thereby the date wheel,to advance rapidly. The desired sudden, intermittent motion of the datewheel is achieved by this means, and the components of the mechanism areso located that the sudden motion occurs at l2 o'clock.

It will thus be seen that the objects set forth above, among those madeapparent from the preceding description, are effciently attained and,since certain changes may be made in the above construction withoutdeparting from the spirit and scope of the invention, it is intendedthat all matter contained in the above description or shown in theaccompanying drawing shall be interpreted as illustrative and not in alimiting sense.

It is also to be understood that the following claims are intended tocover all of the generic and specific features of the invention hereindescribed, and all statements of the scope of the invention which, as amatter of language, might be said to fall therebetween.

What is claimed is:

I. In a watch, a jumper construction comprising a base plate having awall, a toothed member adjacent said base plate and a one-piece springmember secured to said base plate above said wall, and serving to holdsaid toothed member in place, said spring member including a jumper partengaging said toothed member and a spring part urging said jumperagainst said toothed member, said jumper member lying between saidspring member and said wall of said base plate and being limited withrespect to movement by said spring member and said wall of said baseplate.

2. The jumper construction as defined in claim I, wherein said wall isrecessed in that portion adjacent said spring part and said jumper part,saidjumper member lying in said recess.

3. The jumper construction as defined in claim I, wherein said toothedmember is a date wheel.

1. In a watch, a jumper construction comprising a base plate having awall, a toothed member adjacent said base plate and a one-piece springmember secured to said base plate above said wall, and serving to holdsaid toothed member in place, said spring member including a jumper partengaging said toothed member and a spring part urging said jumperagainst said toothed member, said jumper member lying between saidspring member and said wall of said base plate and being limited withrespect to movement by said spring member and said wall of said baseplate.
 2. The jumper construction as defined in claim 1, wherein saidwall is recessed in that portion adjacent said spring part and saidjumper part, said jumper member lying in said recess.
 3. The jumperconstruction as defined in claim 1, wherein said toothed member is adate wheel.